style: add Tailwind Typography plugin for proper markdown rendering

Installed @tailwindcss/typography plugin to fix 'wall of text' issue in documentation.
The prose classes now properly style markdown HTML elements with:
- Proper margins and spacing for headings, paragraphs, lists
- Line-height and typography improvements
- Styled code blocks, blockquotes, tables, and links

Changes:
- Add @tailwindcss/typography to devDependencies
- Configure plugin in tailwind.config.ts
- Regenerate CSS with typography styles included

internal/docs/handler.go

@@ -8,7 +8,7 @@ import (
 	"strings"
 
 	"github.com/yuin/goldmark"
-	"github.com/yuin/goldmark-highlighting"
+	highlighting "github.com/yuin/goldmark-highlighting"
 	"github.com/yuin/goldmark/extension"
 	"github.com/yuin/goldmark/parser"
 	"github.com/yuin/goldmark/renderer/html"
@@ -57,7 +57,7 @@ func (h *DocsHandler) LoadDocument(docPath string) (*templates.Document, error)
 
 	// Default to INDEX.md if root
 	if docPath == "" || docPath == "docs" {
-		docPath = "INDEX.md"
+		docPath = "index.md"
 	} else {
 		// Remove /docs prefix if present
 		docPath = strings.TrimPrefix(docPath, "docs/")